Merge pull request #4956 from pks-t/pks/examples-cgit2-standalone

examples: produce single cgit2 binary

examples/CMakeLists.txt

 INCLUDE_DIRECTORIES(${LIBGIT2_INCLUDES})
 INCLUDE_DIRECTORIES(SYSTEM ${LIBGIT2_SYSTEM_INCLUDES})
 
-FILE(GLOB_RECURSE SRC_EXAMPLE_GIT2 network/*.c network/*.h common.?)
-ADD_EXECUTABLE(cgit2 ${SRC_EXAMPLE_GIT2})
-SET_TARGET_PROPERTIES(cgit2 PROPERTIES C_STANDARD 90)
+FILE(GLOB LG2_SOURCES *.c)
+ADD_EXECUTABLE(lg2 ${LG2_SOURCES})
+SET_TARGET_PROPERTIES(lg2 PROPERTIES C_STANDARD 90)
 
 # Ensure that we do not use deprecated functions internally
 ADD_DEFINITIONS(-DGIT_DEPRECATE_HARD)
 
 IF(WIN32 OR ANDROID)
-	TARGET_LINK_LIBRARIES(cgit2 git2)
+	TARGET_LINK_LIBRARIES(lg2 git2)
 ELSE()
-	TARGET_LINK_LIBRARIES(cgit2 git2 pthread)
+	TARGET_LINK_LIBRARIES(lg2 git2 pthread)
 ENDIF()
-
-FILE(GLOB SRC_EXAMPLE_APPS RELATIVE ${CMAKE_CURRENT_SOURCE_DIR} *.c)
-FOREACH(src_app ${SRC_EXAMPLE_APPS})
-	STRING(REPLACE ".c" "" app_name ${src_app})
-	IF(NOT ${app_name} STREQUAL "common")
-		ADD_EXECUTABLE(${app_name} ${src_app} "common.c")
-		TARGET_LINK_LIBRARIES(${app_name} git2)
-		SET_TARGET_PROPERTIES(${app_name} PROPERTIES C_STANDARD 90)
-	ENDIF()
-ENDFOREACH()

examples/add.c

@@ -15,6 +15,18 @@
 #include "common.h"
 #include <assert.h>
 
+/**
+ * The following example demonstrates how to add files with libgit2.
+ *
+ * It will use the repository in the current working directory, and act
+ * on files passed as its parameters.
+ *
+ * Recognized options are:
+ *   -v/--verbose: show the file's status after acting on it.
+ *   -n/--dry-run: do not actually change the index.
+ *   -u/--update: update the index instead of adding to it.
+ */
+
 enum print_options {
 	SKIP = 1,
 	VERBOSE = 2,
@@ -31,46 +43,46 @@ static void parse_opts(int *options, int *count, int argc, char *argv[]);
 void init_array(git_strarray *array, int argc, char **argv);
 int print_matched_cb(const char *path, const char *matched_pathspec, void *payload);
 
-int main (int argc, char** argv)
+int lg2_add(git_repository *repo, int argc, char** argv)
 {
 	git_index_matched_path_cb matched_cb = NULL;
-	git_repository *repo = NULL;
 	git_index *index;
 	git_strarray array = {0};
 	int options = 0, count = 0;
 	struct print_payload payload = {0};
 
-	git_libgit2_init();
-
 	parse_opts(&options, &count, argc, argv);
-
 	init_array(&array, argc-count, argv+count);
 
-	check_lg2(git_repository_open(&repo, "."), "No git repository", NULL);
 	check_lg2(git_repository_index(&index, repo), "Could not open repository index", NULL);
 
-	if (options&VERBOSE || options&SKIP) {
+	/* Setup a callback if the requested options need it */
+	if ((options & VERBOSE) || (options & SKIP)) {
 		matched_cb = &print_matched_cb;
 	}
 
+	/* Perform the requested action with the index and files */
 	payload.options = options;
 	payload.repo = repo;
 
-	if (options&UPDATE) {
+	if (options & UPDATE) {
 		git_index_update_all(index, &array, matched_cb, &payload);
 	} else {
 		git_index_add_all(index, &array, 0, matched_cb, &payload);
 	}
 
+	/* Cleanup memory */
 	git_index_write(index);
 	git_index_free(index);
-	git_repository_free(repo);
-
-	git_libgit2_shutdown();
 
 	return 0;
 }
 
+/*
+ * This callback is called for each file under consideration by
+ * git_index_(update|add)_all above.
+ * It makes uses of the callback's ability to abort the action.
+ */
 int print_matched_cb(const char *path, const char *matched_pathspec, void *payload)
 {
 	struct print_payload p = *(struct print_payload*)(payload);
@@ -78,18 +90,19 @@ int print_matched_cb(const char *path, const char *matched_pathspec, void *paylo
 	unsigned status;
 	(void)matched_pathspec;
 
+	/* Get the file status */
 	if (git_status_file(&status, p.repo, path)) {
 		return -1;
 	}
 
-	if (status & GIT_STATUS_WT_MODIFIED || status & GIT_STATUS_WT_NEW) {
+	if ((status & GIT_STATUS_WT_MODIFIED) || (status & GIT_STATUS_WT_NEW)) {
 		printf("add '%s'\n", path);
 		ret = 0;
 	} else {
 		ret = 1;
 	}
 
-	if(p.options & SKIP) {
+	if ((p.options & SKIP)) {
 		ret = 1;
 	}
 
@@ -101,11 +114,11 @@ void init_array(git_strarray *array, int argc, char **argv)
 	unsigned int i;
 
 	array->count = argc;
-	array->strings = malloc(sizeof(char*) * array->count);
-	assert(array->strings!=NULL);
+	array->strings = calloc(array->count, sizeof(char *));
+	assert(array->strings != NULL);
 
-	for(i=0; i<array->count; i++) {
-		array->strings[i]=argv[i];
+	for (i = 0; i < array->count; i++) {
+		array->strings[i] = argv[i];
 	}
 
 	return;
@@ -125,33 +138,27 @@ static void parse_opts(int *options, int *count, int argc, char *argv[])
 	int i;
 
 	for (i = 1; i < argc; ++i) {
-		if (argv[i][0] != '-') {
+		if (argv[i][0] != '-')
 			break;
-		}
-		else if(!strcmp(argv[i], "--verbose") || !strcmp(argv[i], "-v")) {
+		else if (!strcmp(argv[i], "--verbose") || !strcmp(argv[i], "-v"))
 			*options |= VERBOSE;
-		}
-		else if(!strcmp(argv[i], "--dry-run") || !strcmp(argv[i], "-n")) {
+		else if (!strcmp(argv[i], "--dry-run") || !strcmp(argv[i], "-n"))
 			*options |= SKIP;
-		}
-		else if(!strcmp(argv[i], "--update") || !strcmp(argv[i], "-u")) {
+		else if (!strcmp(argv[i], "--update") || !strcmp(argv[i], "-u"))
 			*options |= UPDATE;
-		}
-		else if(!strcmp(argv[i], "-h")) {
+		else if (!strcmp(argv[i], "-h")) {
 			print_usage();
 			break;
-		}
-		else if(!strcmp(argv[i], "--")) {
+		} else if (!strcmp(argv[i], "--")) {
 			i++;
 			break;
-		}
-		else {
+		} else {
 			fprintf(stderr, "Unsupported option %s.\n", argv[i]);
 			print_usage();
 		}
 	}
 
-	if (argc<=i)
+	if (argc <= i)
 		print_usage();
 
 	*count = i;

examples/blame.c

@@ -35,30 +35,24 @@ struct opts {
 };
 static void parse_opts(struct opts *o, int argc, char *argv[]);
 
-int main(int argc, char *argv[])
+int lg2_blame(git_repository *repo, int argc, char *argv[])
 {
 	int line, break_on_null_hunk;
 	size_t i, rawsize;
 	char spec[1024] = {0};
 	struct opts o = {0};
 	const char *rawdata;
-	git_repository *repo = NULL;
 	git_revspec revspec = {0};
 	git_blame_options blameopts = GIT_BLAME_OPTIONS_INIT;
 	git_blame *blame = NULL;
 	git_blob *blob;
 	git_object *obj;
 
-	git_libgit2_init();
-
 	parse_opts(&o, argc, argv);
 	if (o.M) blameopts.flags |= GIT_BLAME_TRACK_COPIES_SAME_COMMIT_MOVES;
 	if (o.C) blameopts.flags |= GIT_BLAME_TRACK_COPIES_SAME_COMMIT_COPIES;
 	if (o.F) blameopts.flags |= GIT_BLAME_FIRST_PARENT;
 
-	/** Open the repository. */
-	check_lg2(git_repository_open_ext(&repo, ".", 0, NULL), "Couldn't open repository", NULL);
-
 	/**
 	 * The commit range comes in "commitish" form. Use the rev-parse API to
 	 * nail down the end points.
@@ -131,9 +125,6 @@ int main(int argc, char *argv[])
 	/** Cleanup. */
 	git_blob_free(blob);
 	git_blame_free(blame);
-	git_repository_free(repo);
-
-	git_libgit2_shutdown();
 
 	return 0;
 }

examples/cat-file.c

@@ -120,19 +120,14 @@ static void parse_opts(struct opts *o, int argc, char *argv[]);
 
 
 /** Entry point for this command */
-int main(int argc, char *argv[])
+int lg2_cat_file(git_repository *repo, int argc, char *argv[])
 {
-	git_repository *repo;
 	struct opts o = { ".", NULL, 0, 0 };
 	git_object *obj = NULL;
 	char oidstr[GIT_OID_HEXSZ + 1];
 
-	git_libgit2_init();
-
 	parse_opts(&o, argc, argv);
 
-	check_lg2(git_repository_open_ext(&repo, o.dir, 0, NULL),
-			"Could not open repository", NULL);
 	check_lg2(git_revparse_single(&obj, repo, o.rev),
 			"Could not resolve", o.rev);
 
@@ -188,9 +183,6 @@ int main(int argc, char *argv[])
 	}
 
 	git_object_free(obj);
-	git_repository_free(repo);
-
-	git_libgit2_shutdown();
 
 	return 0;
 }

examples/checkout.c

@@ -172,9 +172,8 @@ cleanup:
 }
 
 /** That example's entry point */
-int main(int argc, char **argv)
+int lg2_checkout(git_repository *repo, int argc, char **argv)
 {
-	git_repository *repo = NULL;
 	struct args_info args = ARGS_INFO_INIT;
 	checkout_options opts;
 	git_repository_state_t state;
@@ -185,15 +184,6 @@ int main(int argc, char **argv)
 	/** Parse our command line options */
 	parse_options(&path, &opts, &args);
 
-	/** Initialize the library */
-	err = git_libgit2_init();
-	if (!err)
-		check_lg2(err, "Failed to initialize libgit2", NULL);
-
-	/** Open the repository corresponding to the options */
-	check_lg2(git_repository_open_ext(&repo, path, 0, NULL),
-			  "Could not open repository", NULL);
-
 	/** Make sure we're not about to checkout while something else is going on */
 	state = git_repository_state(repo);
 	if (state != GIT_REPOSITORY_STATE_NONE) {
@@ -228,8 +218,5 @@ int main(int argc, char **argv)
 cleanup:
 	git_annotated_commit_free(checkout_target);
 
-	git_repository_free(repo);
-	git_libgit2_shutdown();
-
 	return err;
 }

examples/network/clone.c → examples/clone.c

 #include "common.h"
-#include <git2.h>
-#include <git2/clone.h>
-#include <stdio.h>
-#include <stdlib.h>
-#include <string.h>
-#ifndef _WIN32
-# include <pthread.h>
-# include <unistd.h>
-#endif
 
 typedef struct progress_data {
 	git_transfer_progress fetch_progress;
@@ -72,7 +63,7 @@ static void checkout_progress(const char *path, size_t cur, size_t tot, void *pa
 }
 
 
-int do_clone(git_repository *repo, int argc, char **argv)
+int lg2_clone(git_repository *repo, int argc, char **argv)
 {
 	progress_data pd = {{0}};
 	git_repository *cloned_repo = NULL;

examples/common.c

@@ -13,6 +13,9 @@
  */
 
 #include <assert.h>
+#include <stdio.h>
+#include <string.h>
+#include <errno.h>
 
 #include "common.h"
 
@@ -289,3 +292,76 @@ int resolve_refish(git_annotated_commit **commit, git_repository *repo, const ch
 
 	return err;
 }
+
+static int readline(char **out)
+{
+	int c, error = 0, length = 0, allocated = 0;
+	char *line = NULL;
+
+	errno = 0;
+
+	while ((c = getchar()) != EOF) {
+		if (length == allocated) {
+			allocated += 16;
+
+			if ((line = realloc(line, allocated)) == NULL) {
+				error = -1;
+				goto error;
+			}
+		}
+
+		if (c == '\n')
+			break;
+
+		line[length++] = c;
+	}
+
+	if (errno != 0) {
+		error = -1;
+		goto error;
+	}
+
+	line[length] = '\0';
+	*out = line;
+	line = NULL;
+	error = length;
+error:
+	free(line);
+	return error;
+}
+
+int cred_acquire_cb(git_cred **out,
+		const char *url,
+		const char *username_from_url,
+		unsigned int allowed_types,
+		void *payload)
+{
+	char *username = NULL, *password = NULL;
+	int error;
+
+	UNUSED(url);
+	UNUSED(username_from_url);
+	UNUSED(allowed_types);
+	UNUSED(payload);
+
+	printf("Username: ");
+	if (readline(&username) < 0) {
+		fprintf(stderr, "Unable to read username: %s", strerror(errno));
+		return -1;
+	}
+
+	/* Yup. Right there on your terminal. Careful where you copy/paste output. */
+	printf("Password: ");
+	if (readline(&password) < 0) {
+		fprintf(stderr, "Unable to read password: %s", strerror(errno));
+		free(username);
+		return -1;
+	}
+
+	error = git_cred_userpass_plaintext_new(out, username, password);
+
+	free(username);
+	free(password);
+
+	return error;
+}

examples/common.h

@@ -17,6 +17,41 @@
 #include <stdlib.h>
 #include <git2.h>
 
+#ifndef PRIuZ
+/* Define the printf format specifer to use for size_t output */
+#if defined(_MSC_VER) || defined(__MINGW32__)
+#	define PRIuZ "Iu"
+#else
+#	define PRIuZ "zu"
+#endif
+#endif
+
+#define ARRAY_SIZE(x) (sizeof(x)/sizeof(*x))
+#define UNUSED(x) (void)(x)
+
+extern int lg2_add(git_repository *repo, int argc, char **argv);
+extern int lg2_blame(git_repository *repo, int argc, char **argv);
+extern int lg2_cat_file(git_repository *repo, int argc, char **argv);
+extern int lg2_checkout(git_repository *repo, int argc, char **argv);
+extern int lg2_clone(git_repository *repo, int argc, char **argv);
+extern int lg2_describe(git_repository *repo, int argc, char **argv);
+extern int lg2_diff(git_repository *repo, int argc, char **argv);
+extern int lg2_fetch(git_repository *repo, int argc, char **argv);
+extern int lg2_for_each_ref(git_repository *repo, int argc, char **argv);
+extern int lg2_general(git_repository *repo, int argc, char **argv);
+extern int lg2_index_pack(git_repository *repo, int argc, char **argv);
+extern int lg2_init(git_repository *repo, int argc, char **argv);
+extern int lg2_log(git_repository *repo, int argc, char **argv);
+extern int lg2_ls_files(git_repository *repo, int argc, char **argv);
+extern int lg2_ls_remote(git_repository *repo, int argc, char **argv);
+extern int lg2_merge(git_repository *repo, int argc, char **argv);
+extern int lg2_remote(git_repository *repo, int argc, char **argv);
+extern int lg2_rev_list(git_repository *repo, int argc, char **argv);
+extern int lg2_rev_parse(git_repository *repo, int argc, char **argv);
+extern int lg2_show_index(git_repository *repo, int argc, char **argv);
+extern int lg2_status(git_repository *repo, int argc, char **argv);
+extern int lg2_tag(git_repository *repo, int argc, char **argv);
+
 /**
  * Check libgit2 error code, printing error to stderr on failure and
  * exiting the program.
@@ -122,3 +157,12 @@ extern void *xrealloc(void *oldp, size_t newsz);
  * Convert a refish to an annotated commit.
  */
 extern int resolve_refish(git_annotated_commit **commit, git_repository *repo, const char *refish);
+
+/**
+ * Acquire credentials via command line
+ */
+extern int cred_acquire_cb(git_cred **out,
+		const char *url,
+		const char *username_from_url,
+		unsigned int allowed_types,
+		void *payload);

examples/describe.c

@@ -152,23 +152,14 @@ static void describe_options_init(describe_options *opts)
 	git_describe_init_format_options(&opts->format_options, GIT_DESCRIBE_FORMAT_OPTIONS_VERSION);
 }
 
-int main(int argc, char **argv)
+int lg2_describe(git_repository *repo, int argc, char **argv)
 {
-	git_repository *repo;
 	describe_options opts;
 
-	git_libgit2_init();
-
-	check_lg2(git_repository_open_ext(&repo, ".", 0, NULL),
-			"Could not open repository", NULL);
-
 	describe_options_init(&opts);
 	parse_options(&opts, argc, argv);
 
 	do_describe(repo, &opts);
 
-	git_repository_free(repo);
-	git_libgit2_shutdown();
-
 	return 0;
 }

examples/diff.c

@@ -67,9 +67,8 @@ static int color_printer(
 	const git_diff_delta*, const git_diff_hunk*, const git_diff_line*, void*);
 static void diff_print_stats(git_diff *diff, struct opts *o);
 
-int main(int argc, char *argv[])
+int lg2_diff(git_repository *repo, int argc, char *argv[])
 {
-	git_repository *repo = NULL;
 	git_tree *t1 = NULL, *t2 = NULL;
 	git_diff *diff;
 	struct opts o = {
@@ -77,13 +76,8 @@ int main(int argc, char *argv[])
 		-1, 0, 0, GIT_DIFF_FORMAT_PATCH, NULL, NULL, "."
 	};
 
-	git_libgit2_init();
-
 	parse_opts(&o, argc, argv);
 
-	check_lg2(git_repository_open_ext(&repo, o.dir, 0, NULL),
-		"Could not open repository", o.dir);
-
 	/**
 	 * Possible argument patterns:
 	 *
@@ -157,13 +151,9 @@ int main(int argc, char *argv[])
 	}
 
 	/** Cleanup before exiting. */
-
 	git_diff_free(diff);
 	git_tree_free(t1);
 	git_tree_free(t2);
-	git_repository_free(repo);
-
-	git_libgit2_shutdown();
 
 	return 0;
 }

examples/network/fetch.c → examples/fetch.c

 #include "common.h"
-#include <git2.h>
-#include <stdio.h>
-#include <stdlib.h>
-#include <string.h>
-#ifndef _WIN32
-# include <pthread.h>
-# include <unistd.h>
-#endif
 
 static int progress_cb(const char *str, int len, void *data)
 {
@@ -62,7 +54,7 @@ static int transfer_progress_cb(const git_transfer_progress *stats, void *payloa
 }
 
 /** Entry point for this command */
-int fetch(git_repository *repo, int argc, char **argv)
+int lg2_fetch(git_repository *repo, int argc, char **argv)
 {
 	git_remote *remote = NULL;
 	const git_transfer_progress *stats;

examples/for-each-ref.c

@@ -31,19 +31,15 @@ static int show_ref(git_reference *ref, void *data)
         return 0;
 }
 
-int main(int argc, char **argv)
+int lg2_for_each_ref(git_repository *repo, int argc, char **argv)
 {
-        git_repository *repo;
-        git_libgit2_init();
+	UNUSED(argv);
 
-        if (argc != 1 || argv[1] /* silence -Wunused-parameter */)
+        if (argc != 1)
                 fatal("Sorry, no for-each-ref options supported yet", NULL);
 
-        check_lg2(git_repository_open(&repo, "."),
-                  "Could not open repository", NULL);
         check_lg2(git_reference_foreach(repo, show_ref, repo),
                   "Could not iterate over references", NULL);
 
-        git_libgit2_shutdown();
         return 0;
 }

examples/general.c

@@ -76,12 +76,11 @@ static void check_error(int error_code, const char *action)
 	exit(1);
 }
 
-int main (int argc, char** argv)
+int lg2_general(git_repository *repo, int argc, char** argv)
 {
 	int error;
 	git_oid oid;
 	char *repo_path;
-	git_repository *repo;
 
 	/**
 	 * Initialize the library, this will set up any global state which libgit2 needs

examples/network/index-pack.c → examples/index-pack.c

-#include <git2.h>
-#include <stdlib.h>
-#include <stdio.h>
-#include <string.h>
+#include "common.h"
+
 #include <sys/types.h>
 #include <sys/stat.h>
 #include <fcntl.h>
@@ -17,7 +15,6 @@
 #else
 # include <unistd.h>
 #endif
-#include "common.h"
 
 /*
  * This could be run in the main loop whilst the application waits for
@@ -31,7 +28,7 @@ static int index_cb(const git_transfer_progress *stats, void *data)
 	return 0;
 }
 
-int index_pack(git_repository *repo, int argc, char **argv)
+int lg2_index_pack(git_repository *repo, int argc, char **argv)
 {
 	git_indexer *idx;
 	git_transfer_progress stats = {0, 0};

examples/init.c

@@ -40,14 +40,10 @@ struct opts {
 static void create_initial_commit(git_repository *repo);
 static void parse_opts(struct opts *o, int argc, char *argv[]);
 
-
-int main(int argc, char *argv[])
+int lg2_init(git_repository *repo, int argc, char *argv[])
 {
-	git_repository *repo = NULL;
 	struct opts o = { 1, 0, 0, 0, GIT_REPOSITORY_INIT_SHARED_UMASK, 0, 0, 0 };
 
-	git_libgit2_init();
-
 	parse_opts(&o, argc, argv);
 
 	/* Initialize repository. */
@@ -116,7 +112,6 @@ int main(int argc, char *argv[])
 	}
 
 	git_repository_free(repo);
-	git_libgit2_shutdown();
 
 	return 0;
 }

examples/network/git2.c → examples/lg2.c

-#include <stdlib.h>
-#include <stdio.h>
-#include <string.h>
-
-#include "../common.h"
 #include "common.h"
 
 /* This part is not strictly libgit2-dependent, but you can use this
  * as a starting point for a git-like tool */
 
+typedef int (*git_command_fn)(git_repository *, int , char **);
+
 struct {
 	char *name;
-	git_cb fn;
+	git_command_fn fn;
+	char requires_repo;
 } commands[] = {
-	{"ls-remote", ls_remote},
-	{"fetch", fetch},
-	{"clone", do_clone},
-	{"index-pack", index_pack},
-	{ NULL, NULL}
+	{ "add",          lg2_add,          1 },
+	{ "blame",        lg2_blame,        1 },
+	{ "cat-file",     lg2_cat_file,     1 },
+	{ "checkout",     lg2_checkout,     1 },
+	{ "clone",        lg2_clone,        0 },
+	{ "describe",     lg2_describe,     1 },
+	{ "diff",         lg2_diff,         1 },
+	{ "fetch",        lg2_fetch,        1 },
+	{ "for-each-ref", lg2_for_each_ref, 1 },
+	{ "general",      lg2_general,      0 },
+	{ "index-pack",   lg2_index_pack,   1 },
+	{ "init",         lg2_init,         0 },
+	{ "log",          lg2_log,          1 },
+	{ "ls-files",     lg2_ls_files,     1 },
+	{ "ls-remote",    lg2_ls_remote,    1 },
+	{ "merge",        lg2_merge,        1 },
+	{ "remote",       lg2_remote,       1 },
+	{ "rev-list",     lg2_rev_list,     1 },
+	{ "rev-parse",    lg2_rev_parse,    1 },
+	{ "show-index",   lg2_show_index,   0 },
+	{ "status",       lg2_status,       1 },
+	{ "tag",          lg2_tag,          1 },
 };
 
-static int run_command(git_cb fn, git_repository *repo, struct args_info args)
+static int run_command(git_command_fn fn, git_repository *repo, struct args_info args)
 {
 	int error;
 
@@ -35,19 +50,27 @@ static int run_command(git_cb fn, git_repository *repo, struct args_info args)
 	return !!error;
 }
 
+static int usage(const char *prog)
+{
+	size_t i;
+
+	fprintf(stderr, "usage: %s <cmd>...\n\nAvailable commands:\n\n", prog);
+	for (i = 0; i < ARRAY_SIZE(commands); i++)
+		fprintf(stderr, "\t%s\n", commands[i].name);
+
+	exit(EXIT_FAILURE);
+}
+
 int main(int argc, char **argv)
 {
-	int i;
-	int return_code = 1;
-	int error;
-	git_repository *repo;
 	struct args_info args = ARGS_INFO_INIT;
+	git_repository *repo = NULL;
 	const char *git_dir = NULL;
+	int return_code = 1;
+	size_t i;
 
-	if (argc < 2) {
-		fprintf(stderr, "usage: %s <cmd> [repo]\n", argv[0]);
-		exit(EXIT_FAILURE);
-	}
+	if (argc < 2)
+		usage(argv[0]);
 
 	git_libgit2_init();
 
@@ -65,25 +88,33 @@ int main(int argc, char **argv)
 		}
 	}
 
-	/* Before running the actual command, create an instance of the local
-	 * repository and pass it to the function. */
+	if (args.pos == args.argc)
+		usage(argv[0]);
 
-	error = git_repository_open(&repo, git_dir);
-	if (error < 0)
-		repo = NULL;
+	if (!git_dir)
+		git_dir = ".";
 
-	for (i = 0; commands[i].name != NULL; ++i) {
-		if (!strcmp(args.argv[args.pos], commands[i].name)) {
-			return_code = run_command(commands[i].fn, repo, args);
-			goto shutdown;
+	for (i = 0; i < ARRAY_SIZE(commands); ++i) {
+		if (strcmp(args.argv[args.pos], commands[i].name))
+			continue;
+
+		/*
+		 * Before running the actual command, create an instance
+		 * of the local repository and pass it to the function.
+		 * */
+		if (commands[i].requires_repo) {
+			check_lg2(git_repository_open_ext(&repo, git_dir, 0, NULL),
+				  "Unable to open repository '%s'", git_dir);
 		}
+
+		return_code = run_command(commands[i].fn, repo, args);
+		goto shutdown;
 	}
 
 	fprintf(stderr, "Command not found: %s\n", argv[1]);
 
 shutdown:
 	git_repository_free(repo);
-
 	git_libgit2_shutdown();
 
 	return return_code;

examples/log.c

@@ -71,7 +71,7 @@ static int match_with_parent(git_commit *commit, int i, git_diff_options *);
 static int signature_matches(const git_signature *sig, const char *filter);
 static int log_message_matches(const git_commit *commit, const char *filter);
 
-int main(int argc, char *argv[])
+int lg2_log(git_repository *repo, int argc, char *argv[])
 {
 	int i, count = 0, printed = 0, parents, last_arg;
 	struct log_state s;
@@ -81,11 +81,9 @@ int main(int argc, char *argv[])
 	git_commit *commit = NULL;
 	git_pathspec *ps = NULL;
 
-	git_libgit2_init();
-
 	/** Parse arguments and set up revwalker. */
-
 	last_arg = parse_options(&s, &opt, argc, argv);
+	s.repo = repo;
 
 	diffopts.pathspec.strings = &argv[last_arg];
 	diffopts.pathspec.count	  = argc - last_arg;
@@ -180,8 +178,6 @@ int main(int argc, char *argv[])
 
 	git_pathspec_free(ps);
 	git_revwalk_free(s.walker);
-	git_repository_free(s.repo);
-	git_libgit2_shutdown();
 
 	return 0;
 }
@@ -243,13 +239,6 @@ static int add_revision(struct log_state *s, const char *revstr)
 	git_revspec revs;
 	int hide = 0;
 
-	/** Open repo on demand if it isn't already open. */
-	if (!s->repo) {
-		if (!s->repodir) s->repodir = ".";
-		check_lg2(git_repository_open_ext(&s->repo, s->repodir, 0, NULL),
-			"Could not open repository", s->repodir);
-	}
-
 	if (!revstr) {
 		push_rev(s, NULL, hide);
 		return 0;

examples/ls-files.c

@@ -13,7 +13,6 @@
  */
 
 #include "common.h"
-#include "array.h"
 
 /**
  * This example demonstrates the libgit2 index APIs to roughly
@@ -111,21 +110,15 @@ static int print_paths(ls_options *opts, git_index *index)
 	return 0;
 }
 
-int main(int argc, char *argv[])
+int lg2_ls_files(git_repository *repo, int argc, char *argv[])
 {
-	ls_options opts;
-	git_repository *repo = NULL;
 	git_index *index = NULL;
+	ls_options opts;
 	int error;
 
 	if ((error = parse_options(&opts, argc, argv)) < 0)
 		return error;
 
-	git_libgit2_init();
-
-	if ((error = git_repository_open_ext(&repo, ".", 0, NULL)) < 0)
-		goto cleanup;
-
 	if ((error = git_repository_index(&index, repo)) < 0)
 		goto cleanup;
 
@@ -133,8 +126,6 @@ int main(int argc, char *argv[])
 
 cleanup:
 	git_index_free(index);
-	git_repository_free(repo);
-	git_libgit2_shutdown();
 
 	return error;
 }

examples/network/ls-remote.c → examples/ls-remote.c

-#include <git2.h>
-#include <stdlib.h>
-#include <stdio.h>
-#include <string.h>
 #include "common.h"
 
 static int use_remote(git_repository *repo, char *name)
@@ -49,7 +45,7 @@ cleanup:
 }
 
 /** Entry point for this command */
-int ls_remote(git_repository *repo, int argc, char **argv)
+int lg2_ls_remote(git_repository *repo, int argc, char **argv)
 {
 	int error;
 

examples/merge.c

@@ -278,9 +278,8 @@ cleanup:
 	return err;
 }
 
-int main(int argc, char **argv)
+int lg2_merge(git_repository *repo, int argc, char **argv)
 {
-	git_repository *repo = NULL;
 	merge_options opts;
 	git_index *index;
 	git_repository_state_t state;
@@ -292,11 +291,6 @@ int main(int argc, char **argv)
 	merge_options_init(&opts);
 	parse_options(&path, &opts, argc, argv);
 
-	git_libgit2_init();
-
-	check_lg2(git_repository_open_ext(&repo, path, 0, NULL),
-	          "Could not open repository", NULL);
-
 	state = git_repository_state(repo);
 	if (state != GIT_REPOSITORY_STATE_NONE) {
 		fprintf(stderr, "repository is in unexpected state %d\n", state);
@@ -366,8 +360,6 @@ int main(int argc, char **argv)
 cleanup:
 	free(opts.heads);
 	free(opts.annotated);
-	git_repository_free(repo);
-	git_libgit2_shutdown();
 
 	return 0;
 }

examples/network/.gitignore

-/git2

examples/network/Makefile

-default: all
-
-CC = gcc
-CFLAGS += -g
-CFLAGS += -I../../include
-LDFLAGS += -L../../build -L../..
-LIBRARIES += -lgit2 -lpthread
-
-OBJECTS = \
-  git2.o \
-  ls-remote.o \
-  fetch.o \
-  clone.o \
-  index-pack.o \
-  common.o
-
-all: $(OBJECTS)
-	$(CC) $(CFLAGS) $(LDFLAGS) -o git2 $(OBJECTS) $(LIBRARIES)
-
-clean:
-	$(RM) $(OBJECTS)
-	$(RM) git2

examples/network/common.c

-#include "common.h"
-#include <stdio.h>
-#include <string.h>
-#include <errno.h>
-
-/* Shamelessly borrowed from http://stackoverflow.com/questions/3417837/
- * with permission of the original author, Martin Pool.
- * http://sourcefrog.net/weblog/software/languages/C/unused.html
- */
-#ifdef UNUSED
-#elif defined(__GNUC__)
-# define UNUSED(x) UNUSED_ ## x __attribute__((unused))
-#elif defined(__LCLINT__)
-# define UNUSED(x) /*@unused@*/ x
-#else
-# define UNUSED(x) x
-#endif
-
-static int readline(char **out)
-{
-	int c, error = 0, length = 0, allocated = 0;
-	char *line = NULL;
-
-	errno = 0;
-
-	while ((c = getchar()) != EOF) {
-		if (length == allocated) {
-			allocated += 16;
-
-			if ((line = realloc(line, allocated)) == NULL) {
-				error = -1;
-				goto error;
-			}
-		}
-
-		if (c == '\n')
-			break;
-
-		line[length++] = c;
-	}
-
-	if (errno != 0) {
-		error = -1;
-		goto error;
-	}
-
-	line[length] = '\0';
-	*out = line;
-	line = NULL;
-	error = length;
-error:
-	free(line);
-	return error;
-}
-
-int cred_acquire_cb(git_cred **out,
-		const char * UNUSED(url),
-		const char * UNUSED(username_from_url),
-		unsigned int UNUSED(allowed_types),
-		void * UNUSED(payload))
-{
-	char *username = NULL, *password = NULL;
-	int error;
-
-	printf("Username: ");
-	if (readline(&username) < 0) {
-		fprintf(stderr, "Unable to read username: %s", strerror(errno));
-		return -1;
-	}
-
-	/* Yup. Right there on your terminal. Careful where you copy/paste output. */
-	printf("Password: ");
-	if (readline(&password) < 0) {
-		fprintf(stderr, "Unable to read password: %s", strerror(errno));
-		free(username);
-		return -1;
-	}
-
-	error = git_cred_userpass_plaintext_new(out, username, password);
-
-	free(username);
-	free(password);
-
-	return error;
-}

examples/network/common.h

-#ifndef __COMMON_H__
-#define __COMMON_H__
-
-#include <git2.h>
-
-typedef int (*git_cb)(git_repository *, int , char **);
-
-int ls_remote(git_repository *repo, int argc, char **argv);
-int parse_pkt_line(git_repository *repo, int argc, char **argv);
-int show_remote(git_repository *repo, int argc, char **argv);
-int fetch(git_repository *repo, int argc, char **argv);
-int index_pack(git_repository *repo, int argc, char **argv);
-int do_clone(git_repository *repo, int argc, char **argv);
-
-int cred_acquire_cb(git_cred **out,
-		const char * url,
-		const char * username_from_url,
-		unsigned int allowed_types,
-		void *payload);
-
-#ifndef PRIuZ
-/* Define the printf format specifer to use for size_t output */
-#if defined(_MSC_VER) || defined(__MINGW32__)
-#	define PRIuZ "Iu"
-#else
-#	define PRIuZ "zu"
-#endif
-#endif
-
-#endif /* __COMMON_H__ */

examples/remote.c

@@ -48,24 +48,13 @@ static void parse_subcmd(
 	struct opts *opt, int argc, char **argv);
 static void usage(const char *msg, const char *arg);
 
-int main(int argc, char *argv[])
+int lg2_remote(git_repository *repo, int argc, char *argv[])
 {
 	int retval = 0;
 	struct opts opt = {0};
-	git_buf buf = GIT_BUF_INIT_CONST(NULL, 0);
-	git_repository *repo = NULL;
 
 	parse_subcmd(&opt, argc, argv);
 
-	git_libgit2_init();
-
-	check_lg2(git_repository_discover(&buf, ".", 0, NULL),
-		"Could not find repository", NULL);
-
-	check_lg2(git_repository_open(&repo, buf.ptr),
-		"Could not open repository", NULL);
-	git_buf_dispose(&buf);
-
 	switch (opt.cmd)
 	{
 	case subcmd_add:
@@ -85,8 +74,6 @@ int main(int argc, char *argv[])
 		break;
 	}
 
-	git_libgit2_shutdown();
-
 	return retval;
 }
 

examples/rev-list.c

@@ -17,16 +17,12 @@
 
 static int revwalk_parseopts(git_repository *repo, git_revwalk *walk, int nopts, char **opts);
 
-int main (int argc, char **argv)
+int lg2_rev_list(git_repository *repo, int argc, char **argv)
 {
-	git_repository *repo;
 	git_revwalk *walk;
 	git_oid oid;
 	char buf[GIT_OID_HEXSZ+1];
 
-	git_libgit2_init();
-
-	check_lg2(git_repository_open_ext(&repo, ".", 0, NULL), "opening repository", NULL);
 	check_lg2(git_revwalk_new(&walk, repo), "allocating revwalk", NULL);
 	check_lg2(revwalk_parseopts(repo, walk, argc-1, argv+1), "parsing options", NULL);
 
@@ -36,7 +32,6 @@ int main (int argc, char **argv)
 		printf("%s\n", buf);
 	}
 
-	git_libgit2_shutdown();
 	return 0;
 }
 

examples/rev-parse.c

@@ -16,26 +16,20 @@
 
 /** Forward declarations for helpers. */
 struct parse_state {
-	git_repository *repo;
 	const char *repodir;
 	const char *spec;
 	int not;
 };
 static void parse_opts(struct parse_state *ps, int argc, char *argv[]);
-static int parse_revision(struct parse_state *ps);
+static int parse_revision(git_repository *repo, struct parse_state *ps);
 
-
-int main(int argc, char *argv[])
+int lg2_rev_parse(git_repository *repo, int argc, char *argv[])
 {
 	struct parse_state ps = {0};
 
-	git_libgit2_init();
 	parse_opts(&ps, argc, argv);
 
-	check_lg2(parse_revision(&ps), "Parsing", NULL);
-
-	git_repository_free(ps.repo);
-	git_libgit2_shutdown();
+	check_lg2(parse_revision(repo, &ps), "Parsing", NULL);
 
 	return 0;
 }
@@ -68,19 +62,12 @@ static void parse_opts(struct parse_state *ps, int argc, char *argv[])
 	}
 }
 
-static int parse_revision(struct parse_state *ps)
+static int parse_revision(git_repository *repo, struct parse_state *ps)
 {
 	git_revspec rs;
 	char str[GIT_OID_HEXSZ + 1];
 
-	if (!ps->repo) {
-		if (!ps->repodir)
-			ps->repodir = ".";
-		check_lg2(git_repository_open_ext(&ps->repo, ps->repodir, 0, NULL),
-			"Could not open repository from", ps->repodir);
-	}
-
-	check_lg2(git_revparse(&rs, ps->repo, ps->spec), "Could not parse", ps->spec);
+	check_lg2(git_revparse(&rs, repo, ps->spec), "Could not parse", ps->spec);
 
 	if ((rs.flags & GIT_REVPARSE_SINGLE) != 0) {
 		git_oid_tostr(str, sizeof(str), git_object_id(rs.from));
@@ -94,7 +81,7 @@ static int parse_revision(struct parse_state *ps)
 
 		if ((rs.flags & GIT_REVPARSE_MERGE_BASE) != 0) {
 			git_oid base;
-			check_lg2(git_merge_base(&base, ps->repo,
+			check_lg2(git_merge_base(&base, repo,
 						git_object_id(rs.from), git_object_id(rs.to)),
 					"Could not find merge base", ps->spec);
 

examples/showindex.c → examples/show-index.c

@@ -14,7 +14,7 @@
 
 #include "common.h"
 
-int main (int argc, char** argv)
+int lg2_show_index(git_repository *repo, int argc, char** argv)
 {
 	git_index *index;
 	unsigned int i, ecount;
@@ -23,8 +23,6 @@ int main (int argc, char** argv)
 	char out[GIT_OID_HEXSZ+1];
 	out[GIT_OID_HEXSZ] = '\0';
 
-	git_libgit2_init();
-
 	if (argc > 2)
 		fatal("usage: showindex [<repo-dir>]", NULL);
 	if (argc > 1)
@@ -34,7 +32,6 @@ int main (int argc, char** argv)
 	if (dirlen > 5 && strcmp(dir + dirlen - 5, "index") == 0) {
 		check_lg2(git_index_open(&index, dir), "could not open index", dir);
 	} else {
-		git_repository *repo;
 		check_lg2(git_repository_open_ext(&repo, dir, 0, NULL), "could not open repository", dir);
 		check_lg2(git_repository_index(&index, repo), "could not open repository index", NULL);
 		git_repository_free(repo);
@@ -64,7 +61,6 @@ int main (int argc, char** argv)
 	}
 
 	git_index_free(index);
-	git_libgit2_shutdown();
 
 	return 0;
 }

examples/status.c

@@ -67,14 +67,11 @@ static void print_long(git_status_list *status);
 static void print_short(git_repository *repo, git_status_list *status);
 static int print_submod(git_submodule *sm, const char *name, void *payload);
 
-int main(int argc, char *argv[])
+int lg2_status(git_repository *repo, int argc, char *argv[])
 {
-	git_repository *repo = NULL;
 	git_status_list *status;
 	struct opts o = { GIT_STATUS_OPTIONS_INIT, "." };
 
-	git_libgit2_init();
-
 	o.statusopt.show  = GIT_STATUS_SHOW_INDEX_AND_WORKDIR;
 	o.statusopt.flags = GIT_STATUS_OPT_INCLUDE_UNTRACKED |
 		GIT_STATUS_OPT_RENAMES_HEAD_TO_INDEX |
@@ -82,13 +79,6 @@ int main(int argc, char *argv[])
 
 	parse_opts(&o, argc, argv);
 
-	/**
-	 * Try to open the repository at the given path (or at the current
-	 * directory if none was given).
-	 */
-	check_lg2(git_repository_open_ext(&repo, o.repodir, 0, NULL),
-		  "Could not open repository", o.repodir);
-
 	if (git_repository_is_bare(repo))
 		fatal("Cannot report status on bare repository",
 			git_repository_path(repo));
@@ -134,9 +124,6 @@ show_status:
 		goto show_status;
 	}
 
-	git_repository_free(repo);
-	git_libgit2_shutdown();
-
 	return 0;
 }
 

examples/tag.c

@@ -293,18 +293,12 @@ static void tag_options_init(tag_options *opts)
 	opts->force     = 0;
 }
 
-int main(int argc, char **argv)
+int lg2_tag(git_repository *repo, int argc, char **argv)
 {
-	git_repository *repo;
 	tag_options opts;
 	tag_action action;
 	tag_state state;
 
-	git_libgit2_init();
-
-	check_lg2(git_repository_open_ext(&repo, ".", 0, NULL),
-			"Could not open repository", NULL);
-
 	tag_options_init(&opts);
 	parse_options(&action, &opts, argc, argv);
 
@@ -312,8 +306,5 @@ int main(int argc, char **argv)
 	state.opts = &opts;
 	action(&state);
 
-	git_repository_free(repo);
-	git_libgit2_shutdown();
-
 	return 0;
 }

examples/test/test-rev-list.sh

-#!/bin/bash
-
-THIS_FILE="$(readlink -f "$0")"
-ROOT="$(dirname "$(dirname "$(dirname "$THIS_FILE")")")"
-PROGRAM="$ROOT"/examples/rev-list
-LIBDIR="$ROOT"/build
-REPO="$ROOT"/tests/resources/testrepo.git
-
-cd "$REPO"
-
-run () {
-    LD_LIBRARY_PATH="$LIBDIR" "$PROGRAM" "$@"
-}
-
-diff -u - <(run --date-order a4a7dce) <<EOF
-a4a7dce85cf63874e984719f4fdd239f5145052f
-c47800c7266a2be04c571c04d5a6614691ea99bd
-9fd738e8f7967c078dceed8190330fc8648ee56a
-4a202b346bb0fb0db7eff3cffeb3c70babbd2045
-5b5b025afb0b4c913b4c338a42934a3863bf3644
-8496071c1b46c854b31185ea97743be6a8774479
-EOF
-
-out="$(run --topo-order a4a7dce)"
-diff -q - <(echo -n "$out") <<EOF >/dev/null ||
-a4a7dce85cf63874e984719f4fdd239f5145052f
-c47800c7266a2be04c571c04d5a6614691ea99bd
-9fd738e8f7967c078dceed8190330fc8648ee56a
-4a202b346bb0fb0db7eff3cffeb3c70babbd2045
-5b5b025afb0b4c913b4c338a42934a3863bf3644
-8496071c1b46c854b31185ea97743be6a8774479
-EOF
-diff -u - <(echo "$out") <<EOF
-a4a7dce85cf63874e984719f4fdd239f5145052f
-9fd738e8f7967c078dceed8190330fc8648ee56a
-4a202b346bb0fb0db7eff3cffeb3c70babbd2045
-c47800c7266a2be04c571c04d5a6614691ea99bd
-5b5b025afb0b4c913b4c338a42934a3863bf3644
-8496071c1b46c854b31185ea97743be6a8774479
-EOF
-
-diff -u - <(run --date-order --reverse a4a7dce) <<EOF
-8496071c1b46c854b31185ea97743be6a8774479
-5b5b025afb0b4c913b4c338a42934a3863bf3644
-4a202b346bb0fb0db7eff3cffeb3c70babbd2045
-9fd738e8f7967c078dceed8190330fc8648ee56a
-c47800c7266a2be04c571c04d5a6614691ea99bd
-a4a7dce85cf63874e984719f4fdd239f5145052f
-EOF
-
-out=$(run --topo-order --reverse a4a7dce)
-diff -q - <(echo -n "$out") <<EOF >/dev/null ||
-8496071c1b46c854b31185ea97743be6a8774479
-5b5b025afb0b4c913b4c338a42934a3863bf3644
-4a202b346bb0fb0db7eff3cffeb3c70babbd2045
-9fd738e8f7967c078dceed8190330fc8648ee56a
-c47800c7266a2be04c571c04d5a6614691ea99bd
-a4a7dce85cf63874e984719f4fdd239f5145052f
-EOF
-diff -u - <(echo "$out") <<EOF
-8496071c1b46c854b31185ea97743be6a8774479
-5b5b025afb0b4c913b4c338a42934a3863bf3644
-c47800c7266a2be04c571c04d5a6614691ea99bd
-4a202b346bb0fb0db7eff3cffeb3c70babbd2045
-9fd738e8f7967c078dceed8190330fc8648ee56a
-a4a7dce85cf63874e984719f4fdd239f5145052f
-EOF
-
-out="$(run --date-order --topo-order --reverse --reverse a4a7dce)"
-diff -q - <(echo -n "$out") <<EOF >/dev/null ||
-a4a7dce85cf63874e984719f4fdd239f5145052f
-c47800c7266a2be04c571c04d5a6614691ea99bd
-9fd738e8f7967c078dceed8190330fc8648ee56a
-4a202b346bb0fb0db7eff3cffeb3c70babbd2045
-5b5b025afb0b4c913b4c338a42934a3863bf3644
-8496071c1b46c854b31185ea97743be6a8774479
-EOF
-diff -u - <(echo "$out") <<EOF
-a4a7dce85cf63874e984719f4fdd239f5145052f
-9fd738e8f7967c078dceed8190330fc8648ee56a
-4a202b346bb0fb0db7eff3cffeb3c70babbd2045
-c47800c7266a2be04c571c04d5a6614691ea99bd
-5b5b025afb0b4c913b4c338a42934a3863bf3644
-8496071c1b46c854b31185ea97743be6a8774479
-EOF
-
-diff -u - <(run ^9fd738e~2 9fd738e) <<EOF
-9fd738e8f7967c078dceed8190330fc8648ee56a
-4a202b346bb0fb0db7eff3cffeb3c70babbd2045
-EOF
-
-diff -u - <(run --not 9fd738e..9fd738e~2) <<EOF
-9fd738e8f7967c078dceed8190330fc8648ee56a
-4a202b346bb0fb0db7eff3cffeb3c70babbd2045
-EOF